Solution Source Code:

Code Overview

1. Header Files and Namespace:

• <iostream> is included for input and output operations.
• <string> is included for potential future use (not used in this program).
• using namespace std; allows the use of standard functions without prefixing them with std::.

2. User Input Function (ReadNumbers)

• Uses reference parameters (int &Num1, int &Num2, int &Num3) to modify the values directly.
• Prompts the user to enter three numbers and stores them in the provided reference variables.

3. Calculation Function (SumOf3Numbers)

• Takes three integer values as input.
• Returns the sum of the three numbers.

4. Output Function (PrintResults)

• Receives the total sum as a parameter.
• Prints "The total sum of numbers is: [Total]".

5. Program Execution (main())

• Declares three integer variables (Num1, Num2, Num3).
• Calls ReadNumbers() to get user input.
• Calls SumOf3Numbers() to calculate the sum.
• Calls PrintResults() to display the sum.
• Returns 0 to indicate successful execution.

This structured explanation ensures clarity and ease of understanding.